Well it is a the most accurate adaptation of Japanese version of DBZ .. that's allIn ALL honesty IF kai is the accurate dialog from the manga, then the funimation english dubbed original makes me happy i never read the DragonBallZ manga
DBZ's original version was "Americanized" adding one liners and quotes like :-
"Pop goes the weasel" "Adios majin buu!" "MY aim is as GOOD AS EVER! Soo good to be BACK!" with personalized voices making it charming&entertaining whereas the original version was just serious all the time.
For example Vegeta's wisecracks are always hilarious in DBZ dub.